#include "Nguoi.h"
#include "NguoiAnh.h"
#include "NguoiViet.h"
int main(){
	Nguoi *n;
	NguoiAnh na;
	NguoiViet nv;
	n = &nv;
	n->chao();
	n = &na;
	n->chao();
	system("pause");
	return 0;
}